Systematics of Electron Flux Decay Lifetimes in the Outer Radiation Belts

Details Systematics of Electron Flux Decay Lifetimes in the Outer Radiation Belts Systematics of Electron Flux Decay Lifetimes in the Outer Radiation Belts

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm23a1584k&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM23A-1584

Physics

[2716] Magnetospheric Physics / Energetic Particles: Precipitating, [2774] Magnetospheric Physics / Radiation Belts

Scientific paper

The fluxes of energetic electrons in the outer belt are highly dynamic often varying by several orders of magnitude in a matter of a few days. This variability is the result of balance between energization and loss processes. Wave-particle interactions have long been known to cause particle precipitation. Some of the types of waves responsible for particle loss include the EMIC, and the VLF chorus waves. The latter are thought to be important outside the plasmapause whereas inside the plasmapause EMIC waves cause particle loss due to pitch angle scattering. Particle interactions with different types of waves may result in differeent decay timescales. We will report on investigations of electron flux decay times. The aim our research is to delineate the role played by various plasma waves such as plasmaspheric hiss, chorus and EMIC in electron precipitation leading to flux depletion. Our preliminary investigations show a clustering of decay time scales with a preponderance of lifetimes of 5, 10.5, and 17.5 days albeit for a limited data set. This study will use data from multiple spacecraft such as SAMPEX, Polar and HEO to measure electron flux decay times over the entire outer zone. We will also examine decay times as a function of electron energy and cover electron events over nearly a solar cycle. Such a full and detailed study has the potential to examine the conditions under which distinct decay processes may operate.

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